import {z} from 'zod'

export type SaveCustomExamRequest = {customExamTemplateId?: (string | null) | undefined, customExamTemplateVersion?: (number | unknown | null) | undefined, customExamResponseJson?: (string | null) | undefined};

export type CreateApiRecordingsIdExamSaveArgs = {id: string, body: SaveCustomExamRequest};

export type CreateApiRecordingsIdExamSaveOptions = {baseUrl?: string | undefined, Bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const examEmissionFieldResult = z.object({fieldId: z.string(), status: z.string(), message: z.string().nullable().optional()});

export const saveCustomExamResponse = z.object({fieldResults: z.array(examEmissionFieldResult).optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Explicit "Save exam" for the custom exam step (PAW-740): persists the narrative
 * responses like the autosave PATCH, then runs the binding interpreter so bound fields
 * emit real vitals and physical-exam findings. This is the single semantic commit point —
 * the debounced autosave keeps persisting narrative JSON but never interprets.
 * Binding failures never block the save; they come back as per-field results.
 * 
 * POST /Recordings/{id}/exam/save
 */
export const createApiRecordingsIdExamSave = async (args: CreateApiRecordingsIdExamSaveArgs, options?: CreateApiRecordingsIdExamSaveOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/Recordings/${encodeURIComponent(String(args.id))}/exam/save${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(saveCustomExamResponse, await res.json())
};